Advances speed up in areas that need them. For a service rifle, you aren't going to ditch your entire setup for a new gun when your current one works just fine for killing your enemy. Case in point, the Lee-Enfield; the Brits intended to replace it with a new rifle just before the First World War, but because they entered the war (), they couldn't do that. They needed to equip their men right then and there.



), they couldn't do that. They needed to equip their men right then and there.



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